Digital I/O

[MerryMadDad]

Hello, I wrote an application that some of you helped me with.

The application needs to read / write data to the parallel port.

1/ Does anyone know how I can do the same with the USB port.

2/ What hardware do I need for 8 inputs and 8 outputs to USB port on PC and where can I get or make the hardware (internet links etc)

3/ What code would I need to write (and how) to set / read bits individually

4/ Would this work with NT / 2K ?

Grateful for any help at all

Thanks